20729760 has 96 divisors (see below), whose sum is σ = 68765760. Its totient is φ = 5234688.

The previous prime is 20729747. The next prime is 20729771. The reversal of 20729760 is 6792702.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7984 + ... + 10256.

It is an arithmetic number, because the mean of its divisors is an integer number (716310).

Almost surely, 2^20729760 is an apocalyptic number.

20729760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20729760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34382880).

20729760 is an abundant number, since it is smaller than the sum of its proper divisors (48036000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20729760 is a wasteful number, since it uses less digits than its factorization.

20729760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20729760 is about 4552.9946189294. The cubic root of 20729760 is about 274.7038575126.

The spelling of 20729760 in words is "twenty million, seven hundred twenty-nine thousand, seven hundred sixty".